Over doing the RO/DI

[daplatapus]

I have to agree with some of the above. If I had to buy another unit, knowing what I know now, I'd purchase a tds meter and test my water first, then decide what I need. I ended up buying a 4 stage with 2 stage DI unit thinking I should go big or go home. Turns out my city water comes in at 50-60 ppm. I'm reading 0 tds after my RO so my DI is pretty much useless.
Check what you have for tds first before you buy, would be my suggestion. Take into account too if where you live has a history of bad water I'm the spring and make your decision from there.